S = input()
if S == "RRR":
    print(3)
elif S == "SSS":
    print(0)
elif S == "RRS" or S == "SRR":
    print(2)
else:
    print(1) S = input() S input() input if S == "RRR":
    print(3)
elif S == "SSS":
    print(0)
elif S == "RRS" or S == "SRR":
    print(2)
else:
    print(1) S == "RRR" S "RRR" print(3) print 3 elif S == "SSS":
    print(0) S == "SSS" S "SSS" print(0) print 0 elif S == "RRS" or S == "SRR":
    print(2) S == "RRS" or S == "SRR" S == "RRS" S "RRS" S == "SRR" S "SRR" print(2) print 2 print(1) print 1 S = input() input() S
S = input()
if S == "RRR":
    print(3)
elif S == "SSS":
    print(0)
elif S == "RRS" or S == "SRR":
    print(2)
else:
    print(1)